Buying guide
NAS Buying Guide (2026): How to Choose
How to choose a NAS enclosure: bays, CPU, RAM, networking, and software, with a decision framework for every buyer type.
How much NAS do you actually need
Start from the workload, not the spec sheet. File storage, Time Machine backups, and photo sync run fine on any unit here. Plex transcoding needs an Intel chip with Quick Sync. Docker and virtual machines need RAM headroom and an x86 processor. Write down the three things the NAS must do on day one, and buy to that list; most buyers overbuy CPU and underbuy bays.
Two bays or four
Two bays in RAID 1 mirror give you one drive of usable space with full redundancy, enough for backups and documents for years. Four bays matter when libraries grow: SHR or RAID 5 across four drives yields more usable capacity per dollar and lets you expand one drive at a time. If your photo or video library grows every year, four bays pay for themselves in avoided migrations.
Software matters more than hardware
A NAS is a five-to-ten-year appliance, and you will interact with its operating system weekly. Synology DSM is the easiest to live with; QNAP QTS offers deeper backup and snapshot tools for those willing to learn it; TerraMaster TOS covers the basics. Read the software reviews, not just the spec tables, because the OS is the product you actually use.
Decision framework: buy this type if, avoid if
Buy a budget two-bay (DS223j, F2-212) if your job list is backups, file sharing, and photo sync, and you want the lowest credible entry price. Avoid if you already know you will run Plex transcoding or Docker within a year. Buy a 2.5GbE two-bay (TS-233) if large file transfers dominate your use and you have or will buy matching network gear. Avoid if your network is plain gigabit and staying that way. Buy a four-bay Intel unit (DS423+) if you want one NAS for five-plus years covering media, containers, and growth. Avoid if the budget is tight and the workload is genuinely just storage.
Questions, answered
How many drives should I start with?
Two matching NAS-rated drives in a mirror is the standard start: full redundancy from day one. Add drives later as needs grow, especially on four-bay units with flexible RAID.
Do I need NAS-specific hard drives?
Yes. NAS-rated drives (WD Red Plus, Seagate IronWolf) handle vibration and 24/7 operation; desktop drives in RAID arrays fail sooner and can drop out of arrays during error recovery.
Is a NAS safe from ransomware?
Safer than a single external drive, not immune. Use the NAS vendor's snapshot feature, keep an offline or off-site backup, and do not expose management ports to the internet.
How long does a NAS last?
Enclosures commonly run five to eight years; drives are consumables on a three-to-five-year cycle. Buy an enclosure with headroom so the box outlasts at least two drive generations.